ET-Kyoto solution for 48-hour canine lung preservation

Area of Science:

• Organ preservation
• Transplantation research
• Biomedical engineering

Background:

• The established ET-Kyoto (ET-K) solution is safe for 20-hour lung preservation.
• Modifications aimed to extend preservation time: ET-K2 (increased buffer capacity) and ET-K3 (reduced potassium).

Purpose of the Study:

• To evaluate the efficacy of modified ET-K solutions (ET-K2, ET-K3) for extended 48-hour lung preservation.
• To assess the impact of buffer capacity and potassium levels on lung viability and endothelial cell integrity.

Main Methods:

• Lungs were preserved for 48 hours at 4°C using ET-K, ET-K2, or ET-K3 solutions, each containing prostaglandin E1.
• Left lung transplantation was performed, followed by a 6-hour evaluation period.
• Acidification, animal survival, arterial oxygen partial pressure, pulmonary vascular resistance, and endothelial cell morphology were assessed.

Main Results:

• All solutions became acidic post-preservation, with ET-K2 showing the least change.
• Survival rates were 100% for ET-K and ET-K3 groups, but only 20% for the ET-K2 group (p < 0.05).
• ET-K solution (44 mEq/L potassium) exhibited milder endothelial cell damage and lower post-reperfusion pulmonary vascular resistance compared to ET-K3.

Conclusions:

• 48-hour lung preservation is achievable with ET-K and ET-K3 solutions.
• Increased buffer capacity (ET-K2) did not improve outcomes and was associated with reduced survival.
• Potassium levels of 44 mEq/L in the ET-K solution do not compromise endothelial cell integrity during extended preservation.